JP7473122B2 - Concrete structure construction method - Google Patents

Description

The present invention relates to a method for constructing a concrete structure .

For example, when constructing a concrete structure such as a bridge pier, scaffolding is first assembled. After that, reinforcing bars are assembled in the foundation, formwork is assembled to surround the reinforcing bars, and concrete is poured into the formwork. After the concrete has cured and hardened, the formwork is dismantled (see, for example, Patent Document 1).

JP 2011-214290 A

However, assembling and dismantling scaffolding when constructing concrete structures is a cumbersome task and is one of the factors that hinders improvements in the productivity of construction methods for concrete structures.

The present invention has been made in consideration of the above circumstances, and provides a highly productive method for constructing a concrete structure .

The method for constructing a concrete structure according to the present invention includes a layered body forming process in which a concrete fluid is sprayed from a spray nozzle of an additive manufacturing device onto an anchoring member, and the concrete fluid is fixed to the anchoring member to form a layered body, and a concrete structure forming process in which the concrete fluid is sprayed from the spray nozzle onto the layered body, reinforcing the layered body with a reinforcing member provided at a position different from the anchoring member, and forming a concrete structure in which the concrete fluid is further layered onto the layered body.

According to the above-mentioned method for constructing a concrete structure, a concrete fluid is fixed to a fixing member using the spraying method of an additive manufacturing device to form a laminate, and a concrete structure can be automatically manufactured by further layering the concrete fluid on the laminate based on the laminate. This construction method eliminates the need for scaffolding, increasing the productivity of concrete structures.

In the method for constructing a concrete structure according to the present invention, the reinforcing member may be formed from a plurality of linear reinforcing members extending in different directions, the anchoring member may be formed from a mesh body having holes with an area smaller than the area of the gaps between the plurality of reinforcing bars, and in the concrete structure forming process, the reinforcing bars may be filled with the flowable concrete while the flowable concrete is layered on the laminate and the reinforcing member to form the concrete structure.

According to the above-mentioned method for constructing a concrete structure, multiple reinforcing bars can be used as reinforcing members. According to the above-mentioned method for constructing a concrete structure, the fixing members can be easily prepared using a mesh material without using special members, etc.

In the method for constructing a concrete structure according to the present invention, the reinforcing member may be formed from a plurality of reinforcing bars extending in different directions, the anchoring member may be formed from a formwork having a layering surface arranged along the outer shape of the concrete structure, and in the layered body forming process, the layered body may be formed in which the fluid concrete is layered on the layering surface while applying the fluid concrete to the layering surface.

According to the above-mentioned method for constructing a concrete structure, multiple reinforcing bars can be used as reinforcing members. According to the above-mentioned method for constructing a concrete structure, formwork can be used and easily prepared without using special members as fixing members. If the formwork is removed after the concrete mixture has hardened, the weight of the concrete structure can be reduced.

The concrete structure according to the present invention comprises a concrete body formed by layering and hardening concrete fluid sprayed from a spray nozzle of an additive manufacturing device, and a reinforcing member embedded inside the concrete body.

The concrete structure according to the present invention may further include an anchoring member that is disposed at a position different from the reinforcing member and that anchors the concrete fluid injected from the injection nozzle to the anchoring member.

In the concrete structure according to the present invention, the reinforcing member may be composed of a plurality of reinforcing bars extending in different directions, and the anchoring member may be a mesh-like body having holes with an area smaller than the area of the gaps between the plurality of reinforcing bars.

In the concrete structure according to the present invention, the reinforcing member may be composed of multiple reinforcing bars extending in different directions, and the anchoring member may be a formwork having a layered surface that is arranged along the outer shape of the concrete structure.

Each of the above-mentioned concrete structures can be manufactured automatically using the spraying method of additive manufacturing equipment, increasing productivity.

In the concrete structure according to the present invention, the anchoring member may extend in a straight line in a plan view in the area surrounded by the reinforcing member.

In the concrete structure according to the present invention, the anchoring member may be curved in a plan view in the area surrounded by the reinforcing member.

In the concrete structure according to the present invention, the anchoring members may extend radially from a predetermined central position in a plan view in the area surrounded by the reinforcing members.

In the concrete structure according to the present invention, the reinforcement member may be arranged in a frame shape radially outward from the reinforcement member in a plan view.

For each of the above-mentioned concrete structures, the shape and arrangement of the anchoring members can be selected according to the shape of the concrete structure and the composition of the concrete flow, and at least a reinforcing member can be provided.

The present invention can increase the productivity of concrete structures.

FIG. 1 is a side view of a concrete structure according to a first embodiment of the present invention. 2 is a cross-sectional view of the concrete structure shown in FIG. 1, taken along line Z-Z in FIG. 1. FIG. 2 is a side view of a reinforcing member and an anchoring member of the concrete structure shown in FIG. 1 . FIG. 2 is a side view for explaining a construction method for the concrete structure shown in FIG. 1 . FIG. 2 is a side view for explaining a construction method for the concrete structure shown in FIG. 1 . 2 is a cross-sectional view of a concrete structure according to a first modified example of the first embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1. 1. FIG. 4 is a cross-sectional view of a concrete structure according to a second modified example of the first embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1. FIG. 4 is a cross-sectional view of a concrete structure according to a third modified example of the first embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1. FIG. 4 is a cross-sectional view of a concrete structure according to a fourth modified example of the first embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1. FIG. 13 is a cross-sectional view of a concrete structure according to a fifth modified example of the first embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1 is a cross-sectional view of a concrete structure according to a second embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1 is a cross-sectional view of a concrete structure according to a first modified example of the second embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1. FIG. 4 is a cross-sectional view of a concrete structure according to a second modified example of the second embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG. 1. FIG. 4 is a cross-sectional view of a concrete structure according to a third modified example of the second embodiment of the present invention, which corresponds to the cross-sectional view taken along line Z-Z in FIG.

The following describes an embodiment of a method for constructing a concrete structure and a concrete structure according to the present invention with reference to the drawings.

First Embodiment
First, the configuration of a concrete structure 10 according to a first embodiment of the present invention and a method for constructing the concrete structure 10 will be described.

[Configuration of concrete structure]
1 to 3, a concrete structure 10 includes a concrete body 21, a reinforcing member 30, and an anchoring member 40. The concrete structure 10 of the first embodiment is a columnar body used in civil engineering structures, buildings, etc. (not shown), and extends along a direction D1 that is approximately perpendicular to a foundation surface 5 such as the ground or the surface of a foundation. The concrete structure 10 is formed in a substantially rectangular column shape.

The concrete body 21 is formed by layering and hardening concrete fluids sprayed from the spray nozzle (see FIG. 4) of the additive manufacturing device. For example, a hydraulic mixture is used for the concrete body 21, and includes various cement-based materials such as cement paste, mortar, and concrete, as well as a geopolymer composition.

The reinforcing member 30 is embedded inside the concrete body 21 and serves as the core material of the concrete body 21. In the first embodiment, the reinforcing member 30 is formed, for example, from a plurality of reinforcing bars (linear reinforcing bars), and specifically includes a plurality of main bars (reinforcing bars, linear reinforcing bars) 33 and a plurality of tie bars (reinforcing bars, linear reinforcing bars) 34.

A portion of each of the multiple main reinforcements 33 is embedded in the foundation surface 5. The other portion of each of the multiple main reinforcements 33 extends from the foundation surface 5 in the D1 direction. When viewed in a plan view along the D1 direction, the multiple main reinforcements 33 are arranged at a predetermined interval from each other, inside the contour of the concrete structure 10, so as to trace the contour of the concrete structure 10. Hereinafter, the view along the D1 direction will be simply referred to as a "plan view", and the view from a direction intersecting the Z direction, such as the D2 or D3 direction, may be simply referred to as a "side view".

Each of the multiple tie bars 34 is arranged to connect and support the multiple main bars 33 at different positions in the D1 direction. The multiple tie bars 34 are arranged at a predetermined interval from each other in the D1 direction (see Figure 3). In other words, each of the multiple tie bars 34 extends in a different direction from each of the multiple main bars 33 and intersects with each of the multiple main bars 33.

The fixing member 40 is disposed at a position different from at least the reinforcing member 30, and in the first embodiment, is disposed within an area surrounded by a plurality of main reinforcements 33 and tie bars 34 in a plan view. As shown in FIG. 2, the fixing member 40 extends in a straight line along the D2 direction, and further extends in the Z direction from the foundation surface 5. If it is difficult for the fixing member 40 to stand independently on the foundation surface 5, it may be supported by the main reinforcements 33 or tie bars 34 with a restraining member (not shown) or the like.

The fixing member 40 is a member that fixes the concrete fluid sprayed from the spray nozzle of the additive manufacturing device to itself. "Fixing to itself" means that at least a portion of the concrete fluid sprayed from the spray nozzle of the additive manufacturing device toward the fixing member 40 first adheres to the surface of the fixing member 40, and the concrete fluid sprayed from the spray nozzle can then be layered on top of the concrete fluid that has adhered to the surface.

The fixing member 40 is formed of a mesh body 41 formed, for example, in a plate shape. As shown in FIG. 3, a plurality of holes H are formed in the mesh body 41. The holes H have an area smaller than the area of the gap (gap between the reinforcing bars) S between the plurality of main reinforcements 33 and the plurality of tie bars 34 that are in contact with each other. When viewed from the D3 direction, the area of the holes H is considerably smaller than the area of the gap S, and is appropriately set so that the majority of the concrete fluid sprayed from the spray nozzle of the additive manufacturing device onto the mesh body 41 is fixed to the mesh body 41 itself.

The mesh body 41 is a member in which thread-like material made of any material is roughly woven to form holes H, such as wire mesh, continuous fiber sheet, or mesh material made of fiber-reinforced plastic. The reinforcing bar of the reinforcing member 30 is a member in which multiple main reinforcements 33 and tie bars 34, which are different members, are combined so that they come into contact with each other, whereas the mesh body 41 is a member in which multiple woven thread-like materials are integrated.

[Concrete structure construction method]
The method for constructing a concrete structure according to the first embodiment is a method for constructing the above-mentioned concrete structure 10, and includes at least a laminate forming step and a concrete structure forming step.

First, as shown in FIG. 3, multiple main reinforcements 33 are placed on the foundation surface 5 at a predetermined interval in the D2 or D3 direction, and in accordance with the shape of the concrete structure 10. Multiple tie bars 34 are placed so as to connect the multiple main reinforcements 33 at each of multiple predetermined positions in the D1 direction. Next, the mesh body 41 is placed so as to extend in the D2 direction within an area surrounded by the multiple main reinforcements 33 in a plan view, and to extend in the Z direction relative to the foundation surface 5 when viewed from the D3 direction. If it is difficult for the mesh body 41 to stand on its own, the D2-direction end of the mesh body 41 is connected to the main reinforcements 33 or tie bars 34 by a restraining member (not shown) or the like, as necessary.

Next, as shown in FIG. 4, in the laminate formation process, the concrete fluid 121 is sprayed from the spray nozzle 111 of the additive manufacturing device 101 onto the mesh body (fixing member) 41 to form the laminate 130 shown in FIG. 5. The spray nozzle 111 is attached to a robot arm 110 that can move by remote control or travel automatically, for example. In the drawings including FIG. 4, only the spray nozzle 111 and the robot arm 110 of the additive manufacturing device 101 are shown. Note that the configuration of the additive manufacturing device 101 is not particularly limited. In addition, at least one of the additive manufacturing device 101 and the robot arm 110 may be capable of moving by remote control or travel automatically, and both the additive manufacturing device 101 and the robot arm 110 may be capable of moving by remote control or travel automatically.

The injection nozzle 111 injects the concrete fluid 121 in a predetermined direction using the so-called spraying method. The injection nozzle 111 is formed with, for example, multiple injection holes (not shown). From the multiple injection holes, the concrete fluid 121 is injected in a finer grain form than the concrete fluid layered using the so-called layering method.

The concrete fluid 121 injected from the injection nozzle 111 passes through the main reinforcements 33 and the tie bars 34. A part of the concrete fluid 121 that passes through the main reinforcements 33 and the tie bars 34 adheres to the surface of the filamentary material of the mesh body 41, and the rest passes through the holes H of the mesh body 41. As the injection time for a certain area of the mesh body 41 passes, the amount of concrete fluid 121 that is layered on the concrete fluid attached to the mesh body 41 increases, and the amount of concrete fluid 121 that passes through the holes H decreases. In this way, the concrete fluid 121 injected from the injection nozzle 111 is fixed to the mesh body 41. The laminate 130 illustrated in FIG. 4 and the laminate 132 illustrated in FIG. 5 are objects in which the concrete fluid 121 is fixed to and layered on the mesh body 41.

Next, in the concrete structure formation process, the concrete flow material 121 is sprayed from the spray nozzle 111 onto the laminate 130, and the concrete structure 10 is formed while reinforcing it with the main reinforcement 33 and the tie bars 34. Specifically, the concrete flow material 121 sprayed from the spray nozzle 111 is layered onto the laminate 130, and the concrete flow material 121 is sprayed onto another area of the mesh body 41 to grow the laminate 130. When the laminate 130 is grown, the main reinforcement 33 and the tie bars 34 are included. As a result, as shown in FIG. 5, the main reinforcement 33 and the tie bars 34 are embedded in the laminate 132 into which the laminate 130 has grown, and the laminate 132 is reinforced.

The concrete structure 10 is an object in which a concrete flow material 121 is further layered on the laminates 130, 132. However, if only the concrete flow material 121 is layered, the surface of the concrete structure 10 may become rough. Therefore, in the first embodiment, the concrete flow material 122 is sprayed from a spray nozzle 102 different from the spray nozzle 111, following the part onto which the concrete flow material 121 has been sprayed from the spray nozzle 111.

The injection nozzle 102 has multiple injection holes (not shown) that are finer than the injection holes of the injection nozzle 111. Therefore, the concrete flow material 122 is finer than the concrete flow material 121. The concrete flow material 122 is sprayed onto the outside of the laminate 132, and the laminate 132 is formed so as to include all of the main reinforcement 33, the hoop reinforcement 34, and the mesh body 41, forming the laminate 132 with a shape similar to the outer shape of the concrete structure 10. When the injection nozzle 102 is used, the concrete on the outer periphery of the laminate 132 and the concrete structure 10 becomes finer in grain than the concrete on the inner periphery in a plan view.

Then, the concrete flow materials 121, 122 are left for a predetermined time to harden, forming the concrete structure 10.

According to the concrete structure 10 and the method for constructing a concrete structure of the first embodiment described above, the concrete structure 10 can be automatically manufactured using a spraying method of the additive manufacturing device 101 that can be moved by remote control or travel automatically. With the concrete structure 10 and the method for constructing a concrete structure of the first embodiment, there is no need to assemble scaffolding in advance or dismantle the scaffolding after the concrete structure 10 is completed, as is the case when constructing a conventional concrete structure. Furthermore, the concrete structure 10 can be constructed at night when workers are resting, or in places or environments where it is difficult for workers to work, thereby increasing the productivity of the concrete structure 10.

In the concrete structure 10 and the method for constructing a concrete structure of the first embodiment, the reinforcing member 30 is formed from a plurality of main reinforcements 33 and a plurality of tie bars 34. In the concrete structure formation process of the method for constructing a concrete structure of the first embodiment, the concrete structure 10 is formed while filling the plurality of main reinforcements 33 and the plurality of tie bars 34 with a concrete flow material 121. Therefore, according to the concrete structure 10 and the method for constructing a concrete structure, the reinforcing member 30 can be easily prepared using a plurality of reinforcing bars without using special members, etc.

In the concrete structure 10 and the method for constructing a concrete structure of the first embodiment, the fixing member 40 is formed from a mesh body 41. In the layered body formation process of the method for constructing a concrete structure of the first embodiment, the concrete fluid 121 is sprayed from the spray nozzle 111 of the additive manufacturing device 101 onto the mesh body 41 to form the layered bodies 130 and 132. Therefore, according to the concrete structure 10 and the method for constructing a concrete structure, the layered body 130 is first formed, and the concrete structure 10 can be efficiently formed based on the layered body 130. Furthermore, according to the concrete structure 10 and the method for constructing a concrete structure, the fixing member 40 can be easily prepared using the mesh body 41 without using special members or the like.

Note that while FIG. 2 shows that the mesh body 41 extends in a straight line along the D2 direction within the area surrounded by the multiple main reinforcements 33 and tie bars 34 in a plan view, the shape and arrangement of the mesh body 41 can be changed as appropriate. In addition, the mesh body 41 may be arranged only in an area lower than the multiple main reinforcements 33 in the D3 direction, and it is sufficient that the mesh body 41 has a minimum size capable of forming the laminate 130.

For example, as a first modification of the first embodiment, as shown in FIG. 6, the mesh body 41 may extend in a straight line in a direction inclined with respect to both the D2 and D3 directions within an area surrounded by a plurality of main reinforcements 33 and tie bars 34 in a plan view. Even when the mesh body 41 is arranged in this manner, the same effect as in the first embodiment can be obtained, and the length of the mesh body 41 in a plan view can be ensured.

For example, as a second modification of the first embodiment, as shown in FIG. 7, the mesh body 41 may be curved in a region surrounded by a plurality of main reinforcements 33 and tie bars 34 in plan view, and may meander in the direction D2. Even when the mesh body 41 is arranged in this manner, the same effect as in the first embodiment can be obtained, and the length of the mesh body 41 in plan view can be ensured. When the mesh body 41 is curved, scattering of the concrete fluid 121 can be suppressed and the degree of adhesion of the concrete fluid 121 can be increased when the concrete fluid 121 is sprayed from the spray nozzle 111 of the additive manufacturing device 101 toward the convex portion.

For example, as a third modification of the first embodiment, as shown in FIG. 8, the mesh body 41 may extend radially from a predetermined center position C within an area surrounded by a plurality of main reinforcements 33 and tie bars 34 in a plan view, and may extend from the center position C in a total of four directions, including the D2 direction, the direction opposite to the D2 direction, and the D3 direction and the direction opposite to the D3 direction. Even when the mesh body 41 is arranged in this way, the same effect as in the first embodiment can be obtained, and the layered surface 50 of the mesh body 41 in a plan view can be secured widely. In addition, even when the mesh body 41 is arranged in this way, when the concrete fluid 121 is sprayed from the spray nozzle 111 of the additive manufacturing device 101 toward the area sandwiched between the mesh bodies 41 adjacent to each other in the circumferential direction as viewed from the Z direction, the concrete fluid 121 can be prevented from scattering and the degree of fixation of the concrete fluid 121 can be increased.

For example, as a fourth modification of the first embodiment, as shown in Fig. 9, the angle of the arrangement of the mesh body 41 shown in Fig. 8 in a plan view may be rotated so that the mesh body 41 extends in a total of four directions from the center position C, inclined with respect to both the D2 direction and the D3 direction. Even when the mesh body 41 is arranged in this way, the same effect as the third modification can be obtained.

Furthermore, as a fifth modified example of the first embodiment, as shown in FIG. 10, the mesh body 41 may be arranged in a frame shape radially outside the multiple main reinforcements 33 and multiple tie bars 34 in a plan view. Even when the mesh body 41 is arranged in this manner, the same effect as in the first embodiment can be obtained, and the layered surface 50 of the mesh body 41 can be secured widely. When the mesh body 41 is arranged in this manner, for example, in the layered body forming process, a frame-shaped layered body is formed outside the multiple main reinforcements 33 and multiple tie bars 34 in a plan view. Therefore, after the layered body hardens, a concrete flow material 121 may be poured into the area shown by the two-dot chain line in FIG. 10 to form the concrete structure 10.

In addition, in the first embodiment and each of the modified examples, the number and arrangement of the main reinforcement bars 33 and the tie bars 34 can be changed as appropriate according to the shape of the concrete structure 10. The reinforcing member 30 is not limited to steel bars including the main reinforcement bars 33 and the tie bars 34, and may be formed from various metal materials, continuous fibers, fiber reinforced plastics (FRP), etc.

Second Embodiment
Next, a configuration of a concrete structure and a method for constructing a concrete structure according to a second embodiment of the present invention will be described. Note that in the following description of the configuration of the concrete structure and the method for constructing a concrete structure according to the second embodiment, the contents different from the configuration of the concrete structure 10 and the method for constructing a concrete structure according to the first embodiment will be described, and the contents overlapping with the configuration of the concrete structure 10 and the method for constructing a concrete structure according to the first embodiment will be omitted.

As shown in FIG. 11, the concrete structure 12 of the second embodiment includes a concrete body 21, a reinforcing member 30, and an anchoring member 40, similar to the concrete structure 10 of the first embodiment. However, in the second embodiment, the anchoring member 40 is formed of an embedded formwork (formwork) 45 having a layering surface 50 arranged along the outer shape of the concrete structure 12. The embedded formwork 45 extends, for example, along the D1 direction in a plan view. The embedded formwork 45 may be any form that can be used during construction, and there are no particular limitations on the type or material of the embedded formwork 45.

The method for constructing a concrete structure according to the second embodiment is a method for constructing a concrete structure 12, and includes the laminate formation process described in the first embodiment and a concrete structure formation process. Although not shown, in the laminate formation process of the method for constructing a concrete structure according to the second embodiment, a concrete flow material 121 is sprayed from the spray nozzle 111 of the additive manufacturing device 101 so as to hit the layering surface 50 of the embedded formwork 45. This forms a layered body in which the concrete flow material 121 is layered on the layering surface 50. Note that the layering direction of the concrete flow material 121 is not limited to the D3 direction, but includes any direction, including the D2 direction intersecting the layering surface 50 as in the second embodiment.

According to the concrete structure 12 and the method for constructing a concrete structure of the second embodiment described above, the concrete structure 12 can be automatically manufactured, as in the first embodiment. With the concrete structure 12 and the method for constructing a concrete structure of the second embodiment, there is no need to assemble scaffolding in advance, nor to dismantle the scaffolding after the concrete structure 12 is completed, as is the case when constructing a conventional concrete structure. Furthermore, the concrete structure 12 can be constructed at night when workers are resting, or in places or environments where it is difficult for workers to work, thereby increasing the productivity of the concrete structure 12.

In the concrete structure 12 and the method for constructing a concrete structure of the second embodiment, the fixing member 40 is formed using an embedded formwork 45. In the layered body formation process of the method for constructing a concrete structure of the second embodiment, a concrete flow material 121 is applied from the injection nozzle 111 of the additive manufacturing device 101 to the layered surface 50 of the embedded formwork 45 to form a layered body. As in the first embodiment, the concrete structure 12 and the method for constructing a concrete structure first form a layered body, and the concrete structure 12 can be efficiently formed using the layered body as a foundation. In addition, the concrete structure 12 and the method for constructing a concrete structure can easily prepare the fixing member 40 using the embedded formwork 45 without using special members or the like.

Note that while FIG. 11 shows that the embedded formwork 45 extends in a straight line along the D3 direction outside the area surrounded by the multiple main reinforcements 33 and tie bars 34 in a plan view, the shape and arrangement of the embedded formwork 45 can be changed as appropriate. In addition, the embedded formwork 45 may be arranged only in an area lower than the multiple main reinforcements 33 in the D3 direction, and it is sufficient that the embedded formwork 45 has a minimum size capable of forming a laminate.

For example, as a first modification of the second embodiment, as shown in FIG. 12, the embedded formwork 45 may further have a portion extending in the D3 direction in plan view, and portions extending from both ends of the portion in the D3 direction in the opposite direction to the D2 direction. Even when the embedded formwork 45 is arranged in this manner, the same effect as in the second embodiment can be obtained, and a wide layering surface 50 can be ensured. When the concrete flow material 121 is sprayed from the spray nozzle 111 of the additive manufacturing device 101 toward the corner 48 of the embedded formwork 45 in plan view, scattering of the concrete flow material 121 can be suppressed and the degree of adhesion of the concrete flow material 121 can be increased.

For example, as a second modification of the second embodiment, as shown in FIG. 13, the embedded formwork 45 may extend in the direction opposite to the D2 direction and the direction opposite to the D3 direction with the center position C as the connection position. Even when the embedded formwork 45 is arranged in this way, the same effect as the first modification can be obtained.

Furthermore, as a third modified example of the second embodiment, as shown in FIG. 14, the embedded formwork 45 may extend in the direction opposite to the D2 direction and the direction opposite to the D3 direction with two corners 48 as connection positions. The embedded formwork 45 of the third modified example of the second embodiment is the same as the embedded formwork 45 of the first modified example of the second embodiment, with the portion extending in the direction opposite to the D2 direction extended to the end of the concrete body 21. Even when arranged in this manner, the same effect as the first modified example of the second embodiment can be obtained, and the layering surface 50 can be secured to be even wider than the first modified example of the second embodiment.

In the second embodiment, a formwork commonly used in construction may be used instead of the buried formwork 45, and the formwork may be removed after the concrete flow material 121 has completely hardened during construction of the concrete structure 12.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to a specific embodiment. Various modifications of the present invention are possible within the scope of the gist of the present invention described in the claims.

The shape of the concrete structure according to the present invention is not limited to a quadrangular prism (prism) like concrete structure 10, but may be a triangular prism, a hexagonal prism, or a cylinder, or may be a complex shape with complex curved surfaces or any non-flat surface that can be formed using additive manufacturing technology.

In addition, the reinforcing member of the concrete structure according to the present invention is not limited to a reinforcing bar such as reinforcing member 30, but may be formed from a linear reinforcing material made of various metal materials, continuous fiber, fiber-reinforced plastic (FRP), etc. The material of the linear reinforcing material is not particularly limited as long as it satisfies suitable conditions such as having a predetermined strength as a linear reinforcing material. In addition, the reinforcing member may be formed by the additive manufacturing device described above.

The above-mentioned injection nozzle 111 is not limited to being attached to the robot arm 110, but may also be attached to, for example, a gantry crane, a backhoe, or an attachment of various construction machines.

In addition, in the concrete structure according to the present invention, when the fixing members extend radially from a predetermined central position in a plan view in an area surrounded by the reinforcing members, the number of fixing members extending from the predetermined central position is not particularly limited. The number of fixing members extending from the predetermined central position is not limited to four or two as exemplified in each of the above-mentioned embodiments, but may be three or five or more, and may be freely and appropriately set according to the shape of the concrete structure.

In addition, the concrete structure according to the present invention is not limited to a columnar body, but may be, for example, a beam or a wall member, and broadly includes structures that can be formed from concrete.

10, 12 Concrete structure 30 Reinforcement member 40 Anchoring member 33 Main bar (steel bar, linear reinforcement material)
34. Tie bars (reinforcing bars, linear reinforcement)
41 Mesh 45 Buried formwork 101 Additive manufacturing device 111 Spray nozzle 121 Concrete flow material 130, 132 Laminate

Claims (5)

a layered body forming process in which a concrete fluid is sprayed from a spray nozzle of an additive manufacturing device onto a fixing member, and the concrete fluid is fixed to the fixing member to form a layered body;
a concrete structure forming process in which a concrete fluid is sprayed from the spray nozzle onto the layered body to reinforce the layered body with a reinforcing member provided at a position different from that of the fixing member, thereby forming a concrete structure in which the concrete fluid is further layered onto the layered body;
Equipped with
The reinforcing member is formed of a plurality of linear reinforcing members extending in different directions,
the fixing member is formed of a mesh body having holes formed therein, the holes having an area smaller than an area of the gaps between the plurality of linear reinforcing members;
In the concrete structure forming step, the concrete structure is formed in which the concrete flow is layered on the laminate and the reinforcing member while filling the reinforcing member with the concrete flow,
A method for constructing a concrete structure, wherein the anchoring member is arranged curved in a plan view in the area surrounded by the reinforcing member. a layered body forming step of spraying a concrete fluid from a spray nozzle of an additive manufacturing device onto a fixing member, and fixing the concrete fluid to the fixing member to form a layered body;
a concrete structure forming process in which a concrete fluid is sprayed from the spray nozzle onto the layered body to reinforce the layered body with a reinforcing member provided at a position different from that of the fixing member, thereby forming a concrete structure in which the concrete fluid is further layered onto the layered body;
Equipped with
The reinforcing member is formed of a plurality of linear reinforcing members extending in different directions,
the fixing member is formed of a mesh body having holes formed therein, the holes having an area smaller than an area of the gaps between the plurality of linear reinforcing members;
In the concrete structure forming step, the concrete structure is formed in which the concrete flow is layered on the layered body and the reinforcing member while filling the reinforcing member with the concrete flow,
A method for constructing a concrete structure, wherein the fixing members extend radially from a predetermined central position in a plan view in an area surrounded by the reinforcing members. a layered body forming process in which a concrete fluid is sprayed from a spray nozzle of an additive manufacturing device onto a fixing member, and the concrete fluid is fixed to the fixing member to form a layered body;
a concrete structure forming process in which a concrete fluid is sprayed from the spray nozzle onto the layered body to reinforce the layered body with a reinforcing member provided at a position different from that of the fixing member, thereby forming a concrete structure in which the concrete fluid is further layered onto the layered body;
Equipped with
The reinforcing member is formed of a plurality of linear reinforcing members extending in different directions,
the fixing member is formed of a mesh body having holes having an area smaller than an area of the gaps between the plurality of linear reinforcing members ;
In the concrete structure forming step, the concrete structure is formed in which the concrete flow is layered on the layered body and the reinforcing member while filling the reinforcing member with the concrete flow,
A method for constructing a concrete structure, wherein the anchoring member extends in a straight line in a plan view in an area surrounded by the reinforcing member. a layered body forming process in which a concrete fluid is sprayed from a spray nozzle of an additive manufacturing device onto a fixing member, and the concrete fluid is fixed to the fixing member to form a layered body;
a concrete structure forming process in which a concrete fluid is sprayed from the spray nozzle onto the layered body to reinforce the layered body with a reinforcing member provided at a position different from that of the fixing member, thereby forming a concrete structure in which the concrete fluid is further layered onto the layered body;
Equipped with
The reinforcing member is formed of a plurality of linear reinforcing members extending in different directions,
the fixing member is formed of a mesh body having holes having an area smaller than an area of the gaps between the plurality of linear reinforcing members ;
In the concrete structure forming step, the concrete structure is formed in which the concrete flow is layered on the layered body and the reinforcing member while filling the reinforcing member with the concrete flow,
the fixing member is disposed in a frame shape on the radially outer side of the reinforcing member in a plan view,
In the laminate formation step, a frame-shaped laminate is formed in which the fixing member and the reinforcing member are filled with the concrete mixture ,
A method for constructing a concrete structure, comprising the steps of: after the frame-shaped laminate has hardened, pouring the concrete fluid into the interior of the frame-shaped laminate to form the concrete structure. a layered body forming process in which a concrete fluid is sprayed from a spray nozzle of an additive manufacturing device onto a fixing member, and the concrete fluid is fixed to the fixing member to form a layered body;
a concrete structure forming process in which a concrete fluid is sprayed from the spray nozzle onto the layered body to reinforce the layered body with a reinforcing member provided at a position different from that of the fixing member, thereby forming a concrete structure in which the concrete fluid is further layered onto the layered body;
Equipped with
The reinforcing member is formed of a plurality of reinforcing bars extending in different directions from each other,
The fixing member is formed of a plate-shaped embedded formwork having a layering surface that is arranged along the outer shape of the concrete structure and has a portion that extends in a straight line in a plan view ,
A method for constructing a concrete structure, in which, in the laminate formation process, the concrete fluid is applied to the laminate surface while the laminate in which the concrete fluid is laminated on the laminate surface is formed integrally with the buried formwork.

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